Synthesis of pyrimidine-based azo dyes and their metal complexes: photochemical and electrochemical properties

New azo-hetrocyclic dyes based on pyrimidine as ligands containing different groups were designed and synthesized. Further modifications were considered to modify the accepter unit to simultaneously increase its electrion-withdrawing ability and coordination property. Upon complexation to transition metal cations such as Cu (II) a significiant color change occurred, which was followed by absorbtion spectroscopy as a large red shift in ƛmax.